397. Diameter of N-ary TreePOTD
Given the root of an N-ary tree, compute the length of its diameter.
The diameter is defined as the length of the longest path between any two nodes in the tree. (Nary-Tree input serialization is represented in their level order traversal, with each group of children separated by a null value.)
Example 1:

Input: root = [1,null,3,2,4,null,5,6]
Output: 3
Explanation: The diameter of the N-ary tree is the longest path between any two nodes, which in this case is 3.
Example 2:

Input: root = [1,null,2,null,3,4,null,5,null,6]
Output: 4
Explanation: The diameter of the N-ary tree is the longest path between any two nodes, which in this case is 4.
Now Your Turn!
Pick the correct output for the given input
Input: root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]
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Constraints:
- The depth of the n-ary tree is less than or equal to 1000.
- The total number of nodes is between [1, 10⁴].